Which of the following is not correct in case of boron nitride, BN?
It is a good insulator
It is hard because in one of the modifications it has diamond (zinc blende) like structure
It shows magnetc properties
It is chemically unreactive
Anodized aluminium is aluminium
Obtained on anode
Electrolytically coated with aluminium oxide
Alloy of aluminium containing 95% of AI
All of the above
Which of the flowing is most abundant among group 13 elements in the earth’s crust?
B
AI
Ga
In
The blue colored mineral ‘Lapis Lazuli’ which is used as a semiprecious stone is a mineral of the following class
Sodium aluminosilicate
Zinc cobaltate
Basic copper carbonate
All the above
Specify the coordination geometry around and hybridization of N and B atoms in a 1:1 complex of BF3 and NH3
N : tetrahedral, sp3; B : tetrahedral, sp3
N: pyramidal, sp3: B : Pyramidal, sp3
N: pyramidal, sp3; B: planar, sp3
N: Pyramidal, sp3; B ; tetrahedral, sp3
Which of the following sublimes on heating?
AIF3
AICI3
AIBr3
AII3
“Ammonal” used in bombs is a mixture of
AI + NH4NO3
AI + AI2O2 + B2O3
Ag2O3
AI2O3 + C
Rubles and sapphire are chemically
AI2O3
AI2O3 + Ag2O3
Ag2O + Au2O3
Alumina may be converted into anhydrous ALCL3 by
Heating it with conc.HCI
Heating it in a current of dry chlorine
Heating it with rock salt
Mixing it with carbon and heating the mixture in a current of dry chlorine.
Group 13 elements exhibit
Only + 3 oxidation state
Only + 1 oxidation state
Both + 1 and + 3 oxidation states
+1, +3 and -3 oxidation states
